DevTools: allow saving files in the hosted mode.

Change-Id: I34db4fd1972bc42289f1f88031057ec7dfd4e5f8
Reviewed-on: https://chromium-review.googlesource.com/1154204
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Aleksey Kozyatinskiy <kozyatinskiy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578918}

third_party/blink/renderer/devtools/front_end/devtools_compatibility.js

@@ -515,6 +515,13 @@
       DevToolsAPI.sendMessageToEmbedder('append', [url, content], null);
     }
 
+    /**
+     * @override
+     * @param {string} url
+     */
+    close(url) {
+    }
+
     /**
      * @override
      * @param {string} message
@@ -811,59 +818,6 @@
       return true;
     }
 
-    /**
-     * Support for legacy front-ends (<M28).
-     * @return {boolean}
-     */
-    canInspectWorkers() {
-      return true;
-    }
-
-    /**
-     * Support for legacy front-ends (<M28).
-     * @return {boolean}
-     */
-    canSaveAs() {
-      return true;
-    }
-
-    /**
-     * Support for legacy front-ends (<M28).
-     * @return {boolean}
-     */
-    canSave() {
-      return true;
-    }
-
-    /**
-     * Support for legacy front-ends (<M28).
-     */
-    loaded() {
-    }
-
-    /**
-     * Support for legacy front-ends (<M28).
-     * @return {string}
-     */
-    hiddenPanels() {
-      return '';
-    }
-
-    /**
-     * Support for legacy front-ends (<M28).
-     * @return {string}
-     */
-    localizedStringsURL() {
-      return '';
-    }
-
-    /**
-     * Support for legacy front-ends (<M28).
-     * @param {string} url
-     */
-    close(url) {
-    }
-
     /**
      * Support for legacy front-ends (<M44).
      * @param {number} actionCode

third_party/blink/renderer/devtools/front_end/host/InspectorFrontendHost.js

@@ -46,6 +46,10 @@ Host.InspectorFrontendHostStub = class {
         event.stopPropagation();
     }
     document.addEventListener('keydown', stopEventPropagation, true);
+    /**
+     * @type {!Map<string, !Array<string>>}
+     */
+    this._urlsBeingSaved = new Map();
   }
 
   /**
@@ -197,8 +201,13 @@ Host.InspectorFrontendHostStub = class {
    * @param {boolean} forceSaveAs
    */
   save(url, content, forceSaveAs) {
-    Common.console.error('Saving files is not enabled in hosted mode. Please inspect using chrome://inspect');
-    this.events.dispatchEventToListeners(InspectorFrontendHostAPI.Events.CanceledSaveURL, url);
+    let buffer = this._urlsBeingSaved.get(url);
+    if (!buffer) {
+      buffer = [];
+      this._urlsBeingSaved.set(url, buffer);
+    }
+    buffer.push(content);
+    this.events.dispatchEventToListeners(InspectorFrontendHostAPI.Events.SavedURL, {url, fileSystemPath: url});
   }
 
   /**
@@ -207,7 +216,24 @@ Host.InspectorFrontendHostStub = class {
    * @param {string} content
    */
   append(url, content) {
-    Common.console.error('Saving files is not enabled in hosted mode. Please inspect using chrome://inspect');
+    const buffer = this._urlsBeingSaved.get(url);
+    buffer.push(content);
+    this.events.dispatchEventToListeners(InspectorFrontendHostAPI.Events.AppendedToURL, url);
+  }
+
+  /**
+   * @override
+   * @param {string} url
+   */
+  close(url) {
+    const buffer = this._urlsBeingSaved.get(url);
+    this._urlsBeingSaved.delete(url);
+    const fileName = url ? url.trimURL().removeURLFragment() : '';
+    const link = createElement('a');
+    link.download = fileName;
+    const blob = new Blob([buffer.join('')], {type: 'text/plain'});
+    link.href = URL.createObjectURL(blob);
+    link.click();
   }
 
   /**

third_party/blink/renderer/devtools/front_end/host/InspectorFrontendHostAPI.js

@@ -100,12 +100,6 @@ InspectorFrontendHostAPI.prototype = {
    */
   addFileSystem(type) {},
 
-  /**
-   * @param {string} url
-   * @param {string} content
-   */
-  append(url, content) {},
-
   loadCompleted() {},
 
   /**
@@ -182,6 +176,17 @@ InspectorFrontendHostAPI.prototype = {
    */
   save(url, content, forceSaveAs) {},
 
+  /**
+   * @param {string} url
+   * @param {string} content
+   */
+  append(url, content) {},
+
+  /**
+   * @param {string} url
+   */
+  close(url) {},
+
   /**
    * @param {number} requestId
    * @param {string} fileSystemPath